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Method for providing toughened poly(trimethylene terephthalate) molding resins

a technology of triethylene terephthalate and resin, which is applied in the direction of film/foil adhesives, adhesives, etc., can solve the problems of unexpected and deleterious effects on the crystallization rate of ptt, and not always give desirable results for p

Active Publication Date: 2011-05-05
DUPONT POLYMERS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]b-3) optionally, one or more organic additives selected from the group consisting of thermoplastic polymers other tha

Problems solved by technology

Ionomers, which can often act as nucleating agents in polyesters, do not always give desirable results for PTT.
Furthermore, other additives, for instance, the reactive polymer tougheners can have unexpected and deleterious affects on the rate of crystallization of PTT.

Method used

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  • Method for providing toughened poly(trimethylene terephthalate) molding resins
  • Method for providing toughened poly(trimethylene terephthalate) molding resins

Examples

Experimental program
Comparison scheme
Effect test

example 6

[0137]Components of MB-1 listed in Table 3 were fed into the rear of a ZSK 30 mm twin screw extruder and melt blended at a melt temperature of about 260° C. to yield a melt blended composition. The melt blend was extruded into strands and pelletized to provide MB-1 having an ACF value of 5.74.

[0138]MB-1 pellets and the polymer tougheners listed in Table 3 were fed into the rear of a ZSK 30 mm twin screw extruder and melt blended at a melt temperature of about 260° C. to provide a second melt blend composition that was extruded into strands and pelletized. The second melt blend composition had the same components as comparative Example C-7. However, Example 6 exhibited a recrystallization exotherm of 1.8 J / g versus 26.2 J / g for C-7. This demonstrates that a two step melt blending process can provide a product having significantly different properties than a one step melt blending process using the same components.

example 7

[0139]Example 7 illustrates the use of a second masterbatch (MB-2) having a ACF value (52.2) significantly higher than the preferred ACF range of 4 to about 14.

[0140]Components of MB-2 listed in Table 3 were fed into the rear of a ZSK 40 mm twin screw extruder and melt blended at a melt temperature of about 260° C. to yield a melt blended composition. The melt blend was extruded into strands and pelletized to provide MB-2 having about 10 wt % Ionomer-B. MB-2 had an ACF value of 52.2.

[0141]MB-2 pellets, PTT, and the polymer tougheners listed in Table 3 were fed into the rear of a ZSK 40 mm twin screw extruder and melt blended at a melt temperature of about 260° C. to provide a second melt blend composition that was extruded into strands and pelletized. The second melt blend composition had about the same composition as Example 6, with the exception that less thermal stabilizer and lubricant were present. Although the final ACF values of Example 6 (5.59) and 7 (5.22) were similar, Exa...

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Abstract

Disclosed is a method including (A) melt blending first components including (a-1) a poly(trimethylene terephthalate) homopolymer or copolymer resin; and (a-2) one or more ionomer polymers or a combination of one or more ionomer polymers and acid polymers; to provide a first melt blend; and (B) melt blending said first melt blend with one or more Group B polymeric toughener(s) selected from the group consisting of an ethylene copolymers of the formula E / X / Y wherein:E is the radical formed from ethylene;X is selected from the group consisting of radicals formed fromCH2═CH(R1)—C(O)—OR2 Y is one or more radicals formed from selected monomers with the proviso that Y must include at least one radical formed from monomers selected from the group consisting of maleic anhydride, (meth)acrylic acid, maleic acid, maleic acid monoesters, itaconic acid, fumaric acid, fumaric acid monoesters, salts of said preceding acids, and glycidyl acrylate, glycidyl methacrylate, and glycidyl vinyl ether.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit of priority from U.S. Pat. App. No. 61 / 257,108, filed 2 Nov. 2009, which is currently pending and incorporated herein in its entirety.FIELD OF INVENTION[0002]This invention is directed to poly(trimethylene terephthalate) resins and methods for toughening.BACKGROUND OF INVENTION[0003]Thermoplastic polymers are commonly used to manufacture various shaped articles that may be use in applications such as automotive parts, food containers, electrical parts, etc. Shaped articles comprising polyester may be prepared from the molten polymer by a number of melt extrusion processes such as injection molding, compression molding, and blow molding.[0004]Poly(trimethylene) terephthalate (PTT), produced from renewable source of 1,3-propanediol and developed by E. I. du Pont de Nemours & Company (DuPont), is commercially available under Sorona® resin. DuPont pioneered a way to produce the 1,3-propanediol from renewable re...

Claims

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Application Information

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IPC IPC(8): C08L31/08
CPCC08K5/103C08K5/1345C08L23/0876C08L67/02C08L2666/06C08L2666/02
Inventor CHOU, RICHARD T.KOBAYASHI, TOSHIKAZU
Owner DUPONT POLYMERS INC